Fix and enable proguard on packages.
diff --git a/core/proguard_tests.flags b/core/proguard_tests.flags
new file mode 100644
index 0000000..f4063d6
--- /dev/null
+++ b/core/proguard_tests.flags
@@ -0,0 +1,21 @@
+# Keep everything for tests
+-dontshrink -dontobfuscate
+
+#-keep class * extends junit.framework.TestCase {
+# public void test*();
+#}
+
+#-keepclasseswithmembers class * {
+# public static void run();
+# public static junit.framework.Test suite();
+#}
+
+# some AllTests don't include run().
+#-keepclasseswithmembers class * {
+# public static junit.framework.Test suite();
+#}
+
+#-keep class * extends junit.framework.TestSuite
+#-keep class * extends android.app.Instrumentation
+#-keep class * extends android.test.TestSuiteProvider
+